/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2016-2020 Payara Foundation and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://github.com/payara/Payara/blob/main/LICENSE.txt
 * See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at legal/OPEN-SOURCE-LICENSE.txt.
 *
 * GPL Classpath Exception:
 * The Payara Foundation designates this particular file as subject to the "Classpath"
 * exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package fish.payara.nucleus.eventbus;

import com.hazelcast.topic.Message;
import com.hazelcast.topic.MessageListener;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;

/**
 *
 * @author steve
 */
public class TopicListener implements MessageListener {
    
    private final String topicName;
    private UUID registrationID;
    private final Set<MessageReceiver> receivers;

    public TopicListener(String topicName) {
        this.topicName = topicName;
        receivers = ConcurrentHashMap.newKeySet(2);
    }

    public String getTopicName() {
        return topicName;
    }

    public UUID getRegistrationID() {
        return registrationID;
    }

    public void setRegistrationID(UUID registrationID) {
        this.registrationID = registrationID;
    }

    int getReceiverCount() {
        return receivers.size();
    }

    @Override
    @SuppressWarnings("unchecked")
    public void onMessage(Message msg) {
        for (MessageReceiver receiver : receivers) {
            receiver.receiveMessage((ClusterMessage)msg.getMessageObject());
        }
    }

    void addMessageReceiver(MessageReceiver mr) {
        receivers.add(mr);
    }
    
    int removeMessageReceiver(MessageReceiver mr) {
        receivers.remove(mr);
        return receivers.size();
    }
}
